Moreover, Pazhohan et al. and Matsuzaki et al. found higher CD44 expression in the eutopic and/or ectopic endometrial samples of women with endometriosis compared to controls [22,54], a finding in opposition to that of Poncelet at al. and Nothnick et al., who both found lower levels in women with endometriosis than in controls [1,55]. Here, CD44 is linked to endometriosis.